pic: Has a bad habit of doing this and i got him in the act!

[EricH]

Originally Posted by Wetzel

He is also using the power to tighten the chuck which is not the best of ideas...

If this weren't a cordless drill, I'd agree. However, the modern cordless drills can be hand tightened, but no farther, due to inexplicably not having keyed chucks. Hand tight usually isn't good enough when drilling. Modern hand drill chucks are meant to be tightened with a little power, carefully applied.

Of course, they're also meant to be tightened on the shank, not the flutes. Doing it this way dramatically increases the danger.

[A Bear]

Some1 on our Team dropped a drill and cracked it...

[Joe Ross]

Originally Posted by EricH

If this weren't a cordless drill, I'd agree. However, the modern cordless drills can be hand tightened, but no farther, due to inexplicably not having keyed chucks. Hand tight usually isn't good enough when drilling. Modern hand drill chucks are meant to be tightened with a little power, carefully applied.

Just because it's common doesn't mean it's right or safe. From the Dewalt DC940 users manual (which is a modern cordless drill):

WARNING: Do not attempt to tighten drill bits (or any other accessory) by gripping the front
part of the chuck and turning the tool on. Damage to the chuck and personal injury may result.
Always lock off trigger switch when changing accessories.